DIED. JONATHAN GLUCKMAN, 78, white South African pathologist who last year pricked the national conscience with his announcement that he believed from his examination of bodies that police were routinely killing people in custody; of complications following back surgery; in Johannesburg. After the failure of his private appeals to top officials, including President F.W. de Klerk, Gluckman went public in July with claims that 90% of some 200 prisoner autopsies he had performed indicated that the victims had been "violently done to death" by police. "I can't stand it any longer," Gluckman said. "The lower rungs of the police are totally out of control."